66748831 has 2 divisors, whose sum is σ = 66748832. Its totient is φ = 66748830.

The previous prime is 66748793. The next prime is 66748837. The reversal of 66748831 is 13884766.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66748831 is a prime.

It is a super-2 number, since 2×66748831² = 8910812879733122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66748837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33374415 + 33374416.

It is an arithmetic number, because the mean of its divisors is an integer number (33374416).

Almost surely, 2^66748831 is an apocalyptic number.

66748831 is a deficient number, since it is larger than the sum of its proper divisors (1).

66748831 is an equidigital number, since it uses as much as digits as its factorization.

66748831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 43.

The square root of 66748831 is about 8169.9957772327. The cubic root of 66748831 is about 405.6466446744.

The spelling of 66748831 in words is "sixty-six million, seven hundred forty-eight thousand, eight hundred thirty-one".